Honda G100K2 Applications Manual page 17

FUEL SYSTEM
MATCHING AND INSTALLATION RECOMMENDATIONS FOR PROPANE ENGINES
•
Engine stops at high engine speed should be avoided, it can cause afterburn because of higher engine operating
temperature. First lower the engine speed before stopping the engine.
•
Cooling is critical for propane engines.
Install the engine so that the sufficient volume of cooling air can be drawn in under the normal operation
conditions. Be sure that the engine meets the temperature matching requirements.
When the electric starter motor is not mounted, be sure that the fan cover opening is blocked. If not, cooling air
will leak and the engine becomes overheated.
•
In some applications, the engine speed can drop low because of the sudden change of the load. The vacuum at
the carburetor venturi drops, resulting in the fuel cut by the vacuum lock mechanism in the regulator.
To prevent this, a dashpot valve available as spare part, can be integrated in the vacuum hose.
Dashpot check valve: 36135-PH3-004
Wind seal tape at both ends of the dash pot valve and use hose clips.
•
In case of small displacement engines like GX160/200 whose discharge by pulling the recoil starter is small, use
the primer to discharge the air and create sufficient vacuum in order to release the vacuum lock mechanism of
the regulator (full release: less than –20 mm Hg).
The indicated primer bulb from spare parts can be used:
1. 17661-921-000 bulb primer
2. 17665-ZV5-000 valve comp, in
3. 17680-ZV4-000 valve comp, out
4. 17703-921-000 tube clip 20 mm
5. 17704-ZV4-000 tube clip 12.5 mm
•
In order to meet the emission regulations, use IMPCO's regulator model 50(B).
In addition, if UL (fuel lock) is necessary, use model 50. In this case, make sure that the cranking revolution is
more than 600 min
•
The length of the fuel hose between the engine
and the regulator must be as follows for the engine
matching.
GXV340/390
GX610/620, GXV610/620
GX160/200/240/
270/340/390
•
Fuel mixture adjustment.
Adjust the mixture on the regulator so that exhaust emissions CO value is:
At idle speed +/- 5%
At full load
-1
for starting.
457 – 914 mm
610 – 1067 mm
610 – 1067 mm
+/- 2%
Install the regulator upright as shown
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